Hot-air furnace.



No. 662,883. Patonted Nov. 27, |900. A. G. SDERLUND &. F. W. LNNBECK.

HOT AIR FURNACE.

(Application led Aug. 12, 1899.)

2 Sheets-Sheet 1.

(No Model.)

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'ma News news cc. wNoTo-Lrmo.. WASH Nn. 662,883. Patented Nov. 27, i900.A. G. SDERLUND & F. W. LNNBECK. HOT AIR FURNACE.

(Application Bled Aug. 12, 1899.)

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ANDERS GUSTAF SDERLUND, OF STOCKHOLM, SWEDEN, AND FREDRIK WALDEMARLNNBEOK, OF EKENS, RUSSIA; SAID SDERLUND AS- sieNoR To SAID LNNBECK.

i-lO'lw-AlR FURNACE.

SPECIFICATION forming part of Letters Patent No. 662,883, dated November27, 190D.

Application led August 12, 1899, Serial No. 726,991. (No model.)

T0 @ZZ whom it may concern,.-

Be it known that we, ANDERS GUSTAF S- DERLUND, master builder, a subjectof the King of Sweden, residing at Stockholm, in the Kingdom of Sweden,and FREDRIK WALDE- MARLNNBECK, journalist, a subject of the Emperor ofRussia, residing at Ekenas, Finland, in the Empire of Russia, haveinvented certain new and useful Improvements in Hot- Air Furnaces, (forwhich application has been made in England, under No. 4,418, datedFebruary 2, 1899, and in Canada, under Serial No. 84,945, dated March-9,1899,) of which the following is a specification.

This invention relates to an air-heating apparatus whereby fresh 'airfrom the outside is heated to a uniform degree and the heating continueslong after the re has been ext-inguished. lt is best described by aid ofthe accompanying drawings, in which- Figure lis a horizontal section ofthe warming apparatus; Fig. 2, a side elevation of the same structure;Fig. 3, a longitudinal sectional elevation of the same; Fig. 4, atransverse section of the same, taken in a plane between two rows ofpipes. Fig. 5 is a front elevation of the same.

Like letters relate to like -parts on all the drawings.

l/Ve show a brick or masonry air-heater.

b is the heating-stove; fr, the furnace-grate; E, the furnace; e, thelire-doors; R R, a series of circulation or serpentine iiues having`brickwcrk partitions t; T T, a series of tubes passing through holes ineach of the brickwork partitions t and connecting the cold-air chamber Kon one side of the heater with the hot-air chamber W on the oppositeside of the heater.

L is the foul-air chamber below the grate, and P the ash-pit.

o is the foul-air conduit, which is brought from various parts of thebuilding to the foulair chamber L, so as to feed the grate with the foulair and allow it to escape with the smoke. F is the waste-nue, and p adamper arranged so that at any moment the products of combustion byadjusting this damper can be sent direct into the chimney. This isdesirable when first lighting the fire.

B is the chimney.

S S are apertures closed with doors for cleaning the lines.

y is the warm-air outlet, which is taken to orifices in the floors orthe bottoms of the walls to the various rooms of the house.

,c a, Fig. 4, are alternativ'ely-arranged dampers dividing the hot andcold air chambers, respectively, whereby the passage of the air throughthe tubes is obliged to take a circuitous course,beginning withair-chamber K, passing through the lower part of chamber W, then throughthe next part of K, and so on. These dampers can be opened or closed, asrequired.

The mode of action of the entire apparatus is as follows: The prod uctsof coin bustion issuing from the lire-box E are by means of a longwinding flue, or in some cases a single wide flat flue, conductedbetween walls of brickwork or tiles t, in which are embedded the pipesT. The heating apparatus generally can be made of any convenient form,the dimensions varying according to the circumstances of the case andthe amount of heat required. The cold air entering the cold air chamberpasses through the tubes embedded in the brickwork to the hot-airchamber. The brickwork, or, more strictly speaking, tilework orlire-clay blockwork inclosing the tubes is of sufficient thickness to benot easily burned or worn away. It, togetherl with the walls of theflue, acts as a reservoir of heat, regulating and equalizing the amountof heat given to the air-tubes and acting as an accumulator of heat,giving it out long after the ire has been withdrawn. In practice it isproposed to make these tubes about eighteen inches in length and oneinch in diameter and one-eighth of an inch thickness material in smallhouses; but they may be of larger dimensions in larger houses. Theair-chambers can be made of brick work, metal, or any other suitablematerial. They are preferably from six inches to twelve inches in widthand the entire set of tubes open out into them. "Where it is desired toincrease the heating power of the apparatus Very considerably, as inextremelycold weather, the device set forth in Fig. 4 is used', wherethe hot and cold air chambers are IOO subdivided by movable partitionsand the air caused to circulate to and fro through several pipes beforeescaping, and thus the greatly-increased heat of the pipes caused by theVigorous combustion is taken up. These partitions are hinged as shownand are either all moved by a single chain or each moved separately, asdesired.

We decla-re that what We claim is- In an air-heating apparatus, thecombina-- tion of a masonry casing, a furnace therein, a series ofclaywork baiiie-plates extending alternately from opposite extremitiesof said casing, and arranged in staggered relation forming a circuitousflue for the products of combustion from said furnace, a smoke-outletWith which said flue communicates, an outer casing forming With saidmasonry caseeasss ing hot-air and cold-air chambers on opposite sides ofsaid masonry casing respectively, a series of tubes embedded in saidbaille-plates, and providing communication between the hot and cold airchambers respectively and a vertical series of adjustable dam persarranged in the said hot and cold air chambers and adapted to controlthe length of the path of the air through said heating-tubes,substantially as set forth.

In Witness whereof We have hereunto signed our names, this lst day ofJuly, 1899, in the presence of two subscribing witnesses.

ANDERS GUSTAF SDERLUND. FREDRIK WALDEMAR LNNBECK. Vitnesses:

JOHAN NYMAN, H. OELLMER.

